<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
  *{
    padding: 0px;
    margin: 0px;
  }
  li{
    list-style: none;
  }
  .box{
    width: 1200px;
    height: 700px;
    margin: 0 auto;
    background-color: #cccccc;
  }
  .left{
    height: 700px;
    width: 350px;
    background-color: #4CAF50;
    float: left;
  }
  .right{
    height: 700px;
    width: 850px;
    float: left;
    background-color: #b3d4fc;
  }
  .box li{
    width: 245px;
    height: 340px;
    background-color: #993300;
    float: left;
    margin-left: 20px;
    margin-bottom: 20px;
  }
  /*ul .c1{*/
  /*  margin-left: 20px;*/
  /*}*/
</style>
<body>
<div class="box">
  <div class="left"></div>
  <div class="right">
    <ul>
      <li>1</li>
      <li>2</li>
      <li>3</li>
      <li>4</li>
      <li>5</li>
      <li>6</li>
    </ul>
  </div>
</div>
</body>
</html>
